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to provide useful power. It will result in a higher number than Discharge Average Volts
and represents the voltage over a more useful range.
Run Time
How long from the start of discharge until cutoff at the set discharge current? Longer is
better, if you need the time. If your races are short, that means that the pack could have
delivered more power if it was required. Maybe changing to a higher current motor, or
changing the gearing might give you more performance by allowing you to utilize more
of your pack’s stored power.
mAHr
mAHr (milliAmpere-Hours) is the capacity
of a cell or cells expressed as the product of
the discharge current in milliamperes times
the time it delivers this output current in
hours. (a mA is 1/1000 of an ampere.)
Manufacturer’s mAHr rating on the types
of cells R/C racers use is typically printed
right on the cell jacket. mAHrs can flow
into or out of the cell; in other words, we
can use mAHr to describe the rate of
charging or discharging. Due to the built-in
inefficiency of power transfer into and out
of the cell, it will always take more power
to charge up a cell or pack than the cell or
pack can deliver into a load.
You can use this to figure out how long a
pack can supply a given current before it is
spent.
mWHr
mWHr (milliWatt-Hours) is a measure of the power the cell can deliver over time. It is
measured and calculated in the T35-GFX by making a measurement of the output voltage
for a periodic mAHr rate, and multiplying the voltage measurement times the mAHr for
that time period, and totaling the result for the duration of the discharge period until
cutoff.
Relative Internal Resistance
Relative internal resistance was developed by Jeff Pack (a programmer and racer) as a
way of making cell comparisons related to the internal resistance of a cell. You can use it
to compare packs; a lower number is better.
In order to measure this parameter, a full charge/discharge, also known as a Cycle, must
be run. In order to get comparative numbers, you must use similar settings for charge and
discharge current across packs to be compared.
16
Figure 8. Close up of 3300 mAHr cells.
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